/*
 *  Copyright 2013 National Institute of Advanced Industrial Science and Technology
 *  
 *  Licensed under the Apache License, Version 2.0 (the "License");
 *  you may not use this file except in compliance with the License.
 *  You may obtain a copy of the License at
 *  
 *      http://www.apache.org/licenses/LICENSE-2.0
 *  
 *  Unless required by applicable law or agreed to in writing, software
 *  distributed under the License is distributed on an "AS IS" BASIS,
 *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *  See the License for the specific language governing permissions and
 *  limitations under the License.
 */

package org.sss.util;

public abstract class OptionBox<T, E extends OptionBoxIF<T>> implements OptionBoxIF<T> {
  private T value = null;
  private Class<E> klass;

  @SuppressWarnings("unchecked")
  public OptionBox(E... e) {
    Class<E> klass = (Class<E>)e.getClass().getComponentType();
    this.klass = klass;
  }

  @Override
  public T get() {
    return value;
  }

  public E set(T value) {
    this.value = value;
    return klass.cast(this);
  }

  public void setFromBox(Object box) {
    this.value = klass.cast(box).get();
  }

  public static <T, E extends OptionBoxIF<T>> void setSingleOption(String destription, OptionBox<T, E> dest, Object src) {
    if (dest.getClass() == src.getClass()) {
      if (dest.get() != null) {
        throw new IllegalArgumentException(destription + " already has benn specified.");
      }
      dest.setFromBox(src);
    }
  }
}

